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Water heater overpressuring water system? Theo 08-02-2008
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Posted by Theo on August 2, 2008, 8:29 am


Recently replaced old electric water heater with a 40-gallon SuperStor
running off oil furnace. It now overpressures and vents several times a
week. Feed pressure is about 30 PSI. A cheap max-indicating pressure
gauge confirms that pressure jumps whenever a lot of hot water is used,
though it doesn't always reach the 150 PSI needed to vent.

I've tried to convince the installers that 40 gallons of water expanding
from 55F to 140F is going to strain the pipes in this small house, and
that some kind of expansion tank (like the one in the heating system,
right next to the SuperStor) is needed. They think I'm nuts.

Can anyone here offer relevant experience or practice?

Thx-

Theo

AppliancePartsPros.com, Inc.
Posted by DanG on August 2, 2008, 8:43 am


Here is a simple quick explanation of the issues:
http://www.askthebuilder.com/B192_Water_Heaters_-_Expansion_Tanks_.shtml

Use of expansion tanks on hot water heaters is fairly common.

--
______________________________
Keep the whole world singing . . . .
DanG (remove the sevens)
dgriff237@7cox.net



> Recently replaced old electric water heater with a 40-gallon
> SuperStor running off oil furnace. It now overpressures and
> vents several times a week. Feed pressure is about 30 PSI. A
> cheap max-indicating pressure gauge confirms that pressure jumps
> whenever a lot of hot water is used, though it doesn't always
> reach the 150 PSI needed to vent.
>
> I've tried to convince the installers that 40 gallons of water
> expanding from 55F to 140F is going to strain the pipes in this
> small house, and that some kind of expansion tank (like the one
> in the heating system, right next to the SuperStor) is needed.
> They think I'm nuts.
>
> Can anyone here offer relevant experience or practice?
>
> Thx-
>
> Theo



Posted by ransley on August 2, 2008, 8:58 am


> Recently replaced old electric water heater with a 40-gallon SuperStor
> running off oil furnace. It now overpressures and vents several times a
> week. Feed pressure is about 30 PSI. A cheap max-indicating pressure
> gauge confirms that pressure jumps whenever a lot of hot water is used,
> though it doesn't always reach the 150 PSI needed to vent.
>
> I've tried to convince the installers that 40 gallons of water expanding
> from 55F to 140F is going to strain the pipes in this small house, and
> that some kind of expansion tank (like the one in the heating system,
> right next to the SuperStor) is needed. They think I'm nuts.
>
> Can anyone here offer relevant experience or practice?
>
> Thx-
>
> Theo

Dont you mean it runs off your boiler, what vents, the boiler or
heater, On my old pipes I would never let them get over 75, 150Lb ! I
think you are crazy to run it at all. The installer was a hack if it
actualy goes to 150lb. Whay do you even need 140f water, lower it now
to the lowest temp you need to take a hot water shower, with no cold
added. for me thats 95f, it will lower pressure before you break alot
of stuff. Pressure should not be more than incomming. Also you now run
the boiler to heat water in summer, likely that will cost you alot
more in summer.

Posted by Wayne Boatwright on August 2, 2008, 10:10 am


On Sat 02 Aug 2008 05:58:29a, ransley told us...

>> Recently replaced old electric water heater with a 40-gallon SuperStor
>> running off oil furnace. It now overpressures and vents several times a
>> week. Feed pressure is about 30 PSI. A cheap max-indicating pressure
>> gauge confirms that pressure jumps whenever a lot of hot water is used,
>> though it doesn't always reach the 150 PSI needed to vent.
>>
>> I've tried to convince the installers that 40 gallons of water expanding
>> from 55F to 140F is going to strain the pipes in this small house, and
>> that some kind of expansion tank (like the one in the heating system,
>> right next to the SuperStor) is needed. They think I'm nuts.
>>
>> Can anyone here offer relevant experience or practice?
>>
>> Thx-
>>
>> Theo
>
> Dont you mean it runs off your boiler, what vents, the boiler or
> heater, On my old pipes I would never let them get over 75, 150Lb ! I
> think you are crazy to run it at all. The installer was a hack if it
> actualy goes to 150lb. Whay do you even need 140f water, lower it now
> to the lowest temp you need to take a hot water shower, with no cold
> added. for me thats 95f, it will lower pressure before you break alot
> of stuff. Pressure should not be more than incomming. Also you now run
> the boiler to heat water in summer, likely that will cost you alot
> more in summer.
>

If you run a dishwasher you need 140°F water for optimum operation. If you
wash white cotton fabric in the clothes washer, you need similar
temperatures. Believe it or not.

--
Wayne Boatwright
-------------------------------------------
Saturday, 08(VIII)/02(II)/08(MMVIII)
-------------------------------------------
-------------------------------------------
Don't start an argument with somebody
who has a microphone when you don't;
they'll make you look like chopped
liver. --Harlan Ellison, on hecklers
-------------------------------------------


Posted by ransley on August 2, 2008, 11:01 am


> On Sat 02 Aug 2008 05:58:29a, ransley told us...
>
>
>
>
>
> >> Recently replaced old electric water heater with a 40-gallon SuperStor
> >> running off oil furnace. It now overpressures and vents several times =
a
> >> week. Feed pressure is about 30 PSI. A cheap max-indicating pressure
> >> gauge confirms that pressure jumps whenever a lot of hot water is used=
,
> >> though it doesn't always reach the 150 PSI needed to vent.
>
> >> I've tried to convince the installers that 40 gallons of water expandi=
ng
> >> from 55F to 140F is going to strain the pipes in this small house, and
> >> that some kind of expansion tank (like the one in the heating system,
> >> right next to the SuperStor) is needed. They think I'm nuts.
>
> >> Can anyone here offer relevant experience or practice?
>
> >> Thx-
>
> >> Theo
>
> > Dont you mean it runs off your boiler, what vents, the boiler or
> > heater, On my old pipes I would never let them get over 75, 150Lb ! I
> > think you are crazy to run it at all. The installer was a hack if it
> > actualy goes to 150lb. Whay do you even need 140f water, lower it now
> > to the lowest temp you need to take a hot water shower, with no cold
> > added. for me thats 95f, it will lower pressure before you break alot
> > of stuff. Pressure should not be more than incomming. Also you now run
> > the boiler to heat water in summer, likely that will cost you alot
> > more in summer.
>
> If you run a dishwasher you need 140=B0F water for optimum operation. =A0=
If you
> wash white cotton fabric in the clothes washer, you need similar
> temperatures. =A0Believe it or not.
>
> --
> =A0 =A0 =A0 =A0 =A0 =A0 =A0Wayne Boatwright =A0 =A0 =A0 =A0 =A0 =A0
> -------------------------------------------
> =A0 =A0 =A0Saturday, 08(VIII)/02(II)/08(MMVIII)
> -------------------------------------------
> -------------------------------------------
> =A0 =A0Don't start an argument with somebody =A0
> =A0 =A0who has a microphone when you don't; =A0
> =A0 =A0 they'll make you look like chopped =A0 =A0
> =A0 =A0liver. --Harlan Ellison, on hecklers =A0
> -------------------------------------------- Hide quoted text -
>
> - Show quoted text -

Dont all dishwashers have electric heaters to bring the temp to what
is needed, mine does, whites, I use Bleach. No wonder this country
uses 25% of the worlds energy with only 5% of its population, nodody
cares about conservation. 140f is a waste, and if you really think
about where that hot water goes, down the drain. I keep mine around
100f in summer and my gas bill is still high.

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